Photo-lithographer



(No Model.)

WA. H. WILSON.v

Drill Chuck.

No. 240.350. Patented Amir-19, |8181;

UNITED `STATES PATENT Fries.

WILLIAM H. WILSON, OF ONEIDA, NEW YORK.

/ DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 240,350, dated April,19, 1881. Application filed January 5, 1881. (No model.)

To all whom 'it may concern:

Beit known that I, WILLIAM H. WILSON, of Oneida`, in the county ofMadison, in the State ofNew York, have invented new and usefulImprovements in Drill and Lathe Ohucks, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates to the class of chucks usually designatedself-centering chucks.

My inventlon consists in the combination, with the jaws or dogs of achuck, of interchangeable supplemental jaws detachably applied to thejaws proper, by means of which the chuck is adapted for holding` agreater variety of drills and other tools, and the attachment of thesame is facilitated; and my invention furthermore consists in thecombination, with a chuck provided With jaws ordogs adapted for holdingwork to be operated upon, of certain set screws inserted in the face ofthe chuck and adapted to be made to project and support the work heldbythe jaws, all as hereinafter more fully described.

My invention is fully illustrated in the accompanying drawings, whereinFigure l is a face view of my improved chuck as adapted to holdsmall-sized drills; Fig. 2, a face view, showing it for holdinglarger-sized drills or other tools. Fig. 3 shows it arranged for holdingthe work to be operated upon; Fig. 4, a side view of same; Fig. 5, atransverse section on line .fr x in Fig. 4; Fig. 6, anaxial scction;Fig. 7, an isometric view of the supplemental jaw detached, and Fig. 8 adetail view of the screw, by means of which the work held by the jaws issupported.

Similar letters of reference indicate corresponding parts.

A denotes the body of the chuck, having a diametrical groove, G,extending completely across it. In said grooves slide two jaws or dogs,D D, arranged respectively at opposite sides of the axial center of thechuck, and retained in the diametrical groove by tongueand-groove jointsin the sides of said groove and adjacent sides of the jaws. The jaws areadjusted and secured in their requisite position by a right-and-leftscrew, n, which passes through the chuck and engages correspondingright-and-left female threads on the side of the jaws respectively, thescrew -n being properlyjournaled and shouldered in the chuck, so as toprevent longitudinal movement of the screw and compel the same, whenturned, to move the jaws and cause the same to synchronousl y approachand recede from the axial center of the chuck. Thejaws D, I constructwith the usual shoulders or steps, s, for the purpose of holding thework to be operated upon, as indicated by dotted lines in Fig. 4of thedrawings. The two ends of the jaw Iprovide each with a groove, a,adapted to gripe and hold different-sized drills or other tools. Thus,by simply reversingthe jaws D D, I am enabled to make the chuck serveeither as a lathe-chuck for holding the Work to be operated on or as adrill-chuck for holding different-sized tools to operate on work.

To still further augment the range of applicability of my improvedchuck, I provide an interchangeable supplementary jaw, d, in the form ofa block, tted detachably to the face of the jaw'D proper by a dovetail,c, on the latter entering a corresponding dovetail groove inthe back ofthe former. Said block d is wider than the groove G, and is supported byits ends resting on the face ofthe chuck-body. The face of thesupplemental jaw d is provided with a groove, u, smaller than either ofthe grooves in the jaw proper, and adapted to gripe the shank of a thindrill or other tool.

r r represent set-screws working in threaded holes in the chuck atopposite sides of the diametrical groove Gr. These set-screws have around head, h, with a diametrical slot for the application of a screwdriver when said screws are sent home in the chuck and tlush with theface thereof. Back of the head h the screw r has a square or hexagonalportion, t', for the application of a wrench. This peculiar constructionis necessary in order to admit of a proper manipulation of saidset-screws, their function being to support the Work held by the jaws D,and when not required for use they are designed to be flush with theface of the chuck. Hence the necessity for the provisions for theapplication of a screw-driver for starting the set-screws out of thechuck, and for the subsequentapplication of a wrench for bringing saidscrews to bear on the end of the work held between the jaws D.

IOO

Having described my invention, what I claim as new, and desire to secureby Letters Patent, 1s-

1. In combination with a lathe-chuck having a groove, Gr, and a jaw orjaws, D, sliding therein, the supplemental jaw d, detachably applied tothe jaw D and resting with its ends on the face of the chuck,substantially in the manner shown and set forth.

' 2. 1n combination with the chuck A and its jaws dthe set-screws I,substantially as and for the purpose set forth.

3. In combination with the chuck A, the set-screw r, having the circularhead h, with my name and affixed my seal, in the presence zov of twoattesting witnesses, at Syracuse, in the county of Onondaga, in the,State of New York, this 29th day of December, 1880.

WILLIAM H. wILsoN. [L s] Witnesses:

CHARLES E. STEVENS, WM. C. RAYMOND.

